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JP6038493B2 - Tuning circuit - Google Patents

Tuning circuit Download PDF

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Publication number
JP6038493B2
JP6038493B2 JP2012127403A JP2012127403A JP6038493B2 JP 6038493 B2 JP6038493 B2 JP 6038493B2 JP 2012127403 A JP2012127403 A JP 2012127403A JP 2012127403 A JP2012127403 A JP 2012127403A JP 6038493 B2 JP6038493 B2 JP 6038493B2
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Prior art keywords
tuning
frequency
oscillation
inductor
capacitance
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JP2013251876A (en
JP2013251876A5 (en
Inventor
関口　智
智 関口
晋也 稲葉
晋也 稲葉
徹 小田島
徹 小田島
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Semiconductor Components Industries LLC
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Semiconductor Components Industries LLC
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Priority to JP2012127403A priority Critical patent/JP6038493B2/en
Priority to CN201310217926.1A priority patent/CN103457575B/en
Priority to US13/909,143 priority patent/US8862083B2/en
Publication of JP2013251876A publication Critical patent/JP2013251876A/en
Publication of JP2013251876A5 publication Critical patent/JP2013251876A5/ja
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/20—Continuous tuning of single resonant circuit by varying inductance only or capacitance only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/02—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
    • H03J5/0245—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J2200/00—Indexing scheme relating to tuning resonant circuits and selecting resonant circuits
    • H03J2200/10—Tuning of a resonator by means of digitally controlled capacitor bank

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Superheterodyne Receivers (AREA)

Description

本発明は、受信信号をインダクタに印加するとともに、インダクタに接続された同調用可変容量部の容量を変更することでインダクタを含む系の同調周波数を調整し、インダクタに同調信号を得る同調回路に関する。   The present invention relates to a tuning circuit that applies a received signal to an inductor and adjusts the tuning frequency of a system including the inductor by changing the capacitance of a tuning variable capacitor connected to the inductor, thereby obtaining a tuning signal in the inductor. .

従来より、ＡＭラジオにおいては、アンテナからの信号をアンテナ同調回路に供給し、ここで希望局周波数を中心とした同調信号を取り出している。この同調回路として、バリコン（可変容量）をマニュアルで操作し、同調周波数を変更するものがある。この場合、同調周波数を変更しながらスピーカからの出力音を確認して同調周波数を希望のものに設定している。   Conventionally, in AM radio, a signal from an antenna is supplied to an antenna tuning circuit, and a tuning signal centered on a desired station frequency is extracted here. As this tuning circuit, there is one that manually operates a variable capacitor (variable capacitor) to change the tuning frequency. In this case, the output frequency from the speaker is confirmed while changing the tuning frequency, and the desired tuning frequency is set.

一方、デジタル的な同調周波数の調整が増えてきており、この場合希望局周波数についての信号に応じて、キャパシタバンクを切り換えて容量調整をして同調周波数を調整する。この際、受信信号が入力されるインダクタについて共振モードとして、接続されるキャパシタバンクを切り換えて共振周波数が希望局周波数になるようにキャパシタバンクを切り換える。この場合、希望局周波数に追従するように位相ロックループ（ＰＬＬ）や、周波数ロックループ（ＦＬＬ）などを用いて、発振周波数を調整することができる。   On the other hand, digital tuning frequency adjustment is increasing. In this case, the tuning frequency is adjusted by switching the capacitor bank and adjusting the capacitance according to the signal about the desired station frequency. At this time, the capacitor bank is switched so that the resonance frequency becomes the desired station frequency by switching the connected capacitor bank as the resonance mode for the inductor to which the received signal is input. In this case, the oscillation frequency can be adjusted using a phase lock loop (PLL), a frequency lock loop (FLL), or the like so as to follow the desired station frequency.

特開平９−２０００６７号公報Japanese Patent Laid-Open No. 9-200067

発振モードに切り換え、発振周波数を調整する際には、希望局周波数でない信号と発振するために、局発振周波数の調整のノイズ（ＬｏｃａｌＯＳＣ設定ノイズ）や、アンテナ同調信号のノイズ（ＡＮＴ同調ノイズ）が大きく、スピーカらのノイズが大きくならないように出力にミュートを掛けている。   When switching to the oscillation mode and adjusting the oscillation frequency, the oscillation of the local oscillation frequency (LocalOSC setting noise) and the antenna tuning signal noise (ANT tuning noise) occur because the signal oscillates with a signal other than the desired station frequency. The output is muted so that loudspeaker noise does not increase.

従って、このような同調回路では、スピーカからの出力音を聞きながら、同調周波数を調整することができない。   Therefore, with such a tuning circuit, the tuning frequency cannot be adjusted while listening to the output sound from the speaker.

本発明は、一対のインダクタおよび同調用可変容量部を含み、同調用可変容量部の容量を変更することで同調周波数を調整し、受信信号から帯域が限定された同調信号を得る同調回路であって、同調信号に対応する電流を流す発振用インダクタと、発振用インダクタを含む系の発振周波数を調整する発振用可変容量部と、前記発振用可変容量部の容量を希望同調周波数に応じて変更しながら、前記発振周波数を希望同調周波数に対応した容量に調整し、調整された発振用可変容量部の容量に対応して前記同調用可変容量部の容量を調整する制御部と、を含むことを特徴とする。   The present invention is a tuning circuit that includes a pair of inductors and a tuning variable capacitor, adjusts the tuning frequency by changing the capacitance of the tuning variable capacitor, and obtains a tuning signal having a limited band from the received signal. The oscillation inductor for passing a current corresponding to the tuning signal, the oscillation variable capacitor for adjusting the oscillation frequency of the system including the oscillation inductor, and the capacitance of the oscillation variable capacitor according to the desired tuning frequency are changed. A control unit that adjusts the oscillation frequency to a capacitance corresponding to a desired tuning frequency and adjusts the capacitance of the tuning variable capacitance unit corresponding to the adjusted capacitance of the oscillation variable capacitance unit. It is characterized by.

また、前記発振用インダクタを含む系の発振周波数は、前記同調周波数の整数倍であり両者は相関して調整されることが好適である。   The oscillation frequency of the system including the oscillation inductor is preferably an integral multiple of the tuning frequency, and both are preferably adjusted in correlation.

また、前記整数倍は４倍であることが好適である。   The integer multiple is preferably 4 times.

本発明によれば、発振用可変容量部の容量を希望同調周波数に応じて変更しながら、発振周波数を希望同調周波数に対応した容量に調整し、調整された発振用可変容量部の容量に対応して同調用可変容量部の容量を調整する。従って、発振周波数を調整しながら、同調周波数を調整することができ、同調信号の出力をミュートすることなく同調周波数の調整が可能になる。   According to the present invention, while changing the capacitance of the oscillation variable capacitor according to the desired tuning frequency, the oscillation frequency is adjusted to the capacitance corresponding to the desired tuning frequency, and the adjusted capacitance of the oscillation variable capacitor is supported. Then, the capacity of the tuning variable capacitor is adjusted. Therefore, the tuning frequency can be adjusted while adjusting the oscillation frequency, and the tuning frequency can be adjusted without muting the output of the tuning signal.

実施形態の構成を示すブロック図である。It is a block diagram which shows the structure of embodiment.

以下、本発明の実施形態について、図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は、一実施形態の構成を示すブロック図である。アンテナからの信号は同調回路１０のインダクタ１２に印加される。なお、アンテナの他端はアースに接続されている。インダクタ１２には、鉄心を介し、インダクタ１４が磁気結合されており、インダクタ１２に流れる電流に応じた電流が流れ、これがアンプ１６を介しミキサ１８に供給される。なお、インダクタ１４の他端には基準電圧が供給されている。   FIG. 1 is a block diagram illustrating a configuration of an embodiment. A signal from the antenna is applied to the inductor 12 of the tuning circuit 10. The other end of the antenna is connected to the ground. The inductor 12 is magnetically coupled to the inductor 12 via an iron core, and a current corresponding to the current flowing through the inductor 12 flows, and this is supplied to the mixer 18 via the amplifier 16. A reference voltage is supplied to the other end of the inductor 14.

ミキサ１８には、ローカル発振器２０からのローカル信号がバッファ２２を介し供給されている。ここで、ローカル発振器２０は、制御部２４によって発振周波数が変更される。すなわち、希望局周波数とＩＦ（中間周波数：ＡＭ放送では例えば４５０ｋＨｚ）だけ離れた周波数に調整される。   A local signal from the local oscillator 20 is supplied to the mixer 18 via a buffer 22. Here, the oscillation frequency of the local oscillator 20 is changed by the control unit 24. That is, the frequency is adjusted to a frequency separated from the desired station frequency by IF (intermediate frequency: 450 kHz in AM broadcasting, for example).

従って、ミキサ１８の出力に希望局信号についてのＩＦ信号が得られる。このＩＦ信号はＩＦ検出部２６に供給され、ここで復調されてベースバンド信号に変換される。ＩＦ検出部２６の出力は、ベースバンドアンプ２８で所定の増幅を受け、スピーカから音声出力される。なお、ＡＭ放送であれば、振幅変調であり、ＩＦ検出部２６はキャリアを除去することでベースバンド信号を取り出すが、他の変調方式であってもかまわない。   Therefore, an IF signal for the desired station signal is obtained at the output of the mixer 18. This IF signal is supplied to the IF detector 26, where it is demodulated and converted into a baseband signal. The output of the IF detection unit 26 is subjected to predetermined amplification by the baseband amplifier 28 and is output as sound from a speaker. In the case of AM broadcasting, amplitude modulation is used, and the IF detection unit 26 extracts the baseband signal by removing the carrier, but other modulation methods may be used.

ここで、同調回路１０において、インダクタ１２には、複数の容量を内蔵したキャパシタバンク３０が接続されている。また、キャパシタバンク３０の他端はアースに接続されている。さらに、キャパシタバンク３０には、制御部３２が接続されており、この制御部３２によって、キャパシタバンク３０の複数の容量の接続を制御することで、キャパシタバンク３０の容量が変更されて、同調回路１０の同調周波数が制御される。すなわち、インダクタ１２がキャパシタバンク３０を介し、アースに接続されることになり、インダクタ１２とキャパシタバンク３０からなる回路の共振周波数がキャパシタバンク３０の容量によって制御されることになる。   Here, in the tuning circuit 10, a capacitor bank 30 having a plurality of capacitors is connected to the inductor 12. The other end of the capacitor bank 30 is connected to the ground. Further, a control unit 32 is connected to the capacitor bank 30, and the control unit 32 controls connection of a plurality of capacitances of the capacitor bank 30, thereby changing the capacitance of the capacitor bank 30. Ten tuning frequencies are controlled. That is, the inductor 12 is connected to the ground via the capacitor bank 30, and the resonance frequency of the circuit including the inductor 12 and the capacitor bank 30 is controlled by the capacitance of the capacitor bank 30.

なお、キャパシタバンク３０は、複数のキャパシタを並列接続し各キャパシタにスイッチを直列接続したものや、複数のキャパシタを直列接続し各キャパシタのバイパス経路にスイッチを設けるものや、これらを組み合わせたもので、スイッチのオンオフを制御することで容量を変更するものを採用することができる。   The capacitor bank 30 includes a plurality of capacitors connected in parallel and a switch connected in series to each capacitor, a plurality of capacitors connected in series and a switch provided in the bypass path of each capacitor, or a combination of these. It is possible to employ one that changes the capacity by controlling on / off of the switch.

また、制御部３２には、可変抵抗３４が接続されており、この可変抵抗３４がユーザの希望局選択に応じて制御される。例えば、ラジオ本体に設けられている選局用つまみなどの操作に応じて可変抵抗３４の抵抗値が変化する。なお、制御部３２には、マイクロコンピュータや、ステートマシーンなどが利用される。   Further, a variable resistor 34 is connected to the control unit 32, and this variable resistor 34 is controlled according to the user's desired station selection. For example, the resistance value of the variable resistor 34 changes according to the operation of a tuning knob or the like provided on the radio body. The control unit 32 uses a microcomputer, a state machine, or the like.

ここで、同調回路１０には、インダクタ３６が設けられており、インダクタ１２と鉄心を介し磁気的に結合している。そして、インダクタ３６には、キャパシタバンク３８が接続されている。なお、インダクタ３６の他端はアースに接続されている。   Here, the tuning circuit 10 is provided with an inductor 36 and is magnetically coupled to the inductor 12 via an iron core. A capacitor bank 38 is connected to the inductor 36. The other end of the inductor 36 is connected to the ground.

一方、キャパシタバンク３８の他端にはアンプ４０が接続され、このアンプ４０の出力は、インダクタ３６と、キャパシタバンク３８の接続点に接続されている。従って、アンプ４０の出力がキャパシタバンク３０の入力側に帰還するループが形成され、インダクタ３６、キャパシタバンク３８からなる回路が能動的に発振することになり、その発振周波数がキャパシタバンク３８の容量値で制御されることになる。   On the other hand, an amplifier 40 is connected to the other end of the capacitor bank 38, and an output of the amplifier 40 is connected to a connection point between the inductor 36 and the capacitor bank 38. Therefore, a loop in which the output of the amplifier 40 is fed back to the input side of the capacitor bank 30 is formed, and a circuit including the inductor 36 and the capacitor bank 38 actively oscillates, and the oscillation frequency is the capacitance value of the capacitor bank 38. It will be controlled by.

そして、キャパシタバンク３８の出力は、分周器４２にも入力され、ここで適当な分周比で、分周された後、カウンタ４４に入力される。カウンタ４４は、周波数カウンタであり、分周後の信号の例えば１周期（半周期や、複数周期などでもかまわない）をカウントすることで周波数についてのカウント結果を制御部３２に供給する。制御部３２は、カウンタ４４からのカウント結果から、発振周波数を検出し、発振周波数が目標とする希望局周波数の４倍になるようにキャパシタバンク３８の容量値を制御するとともに、キャパシタバンク３０の容量値も同様に制御する。なお、分周器４２を設けることで、半周期などをカウントする場合においてもカウンタ４４のクロックをそれほど早くする必要がなくなる。   The output of the capacitor bank 38 is also input to the frequency divider 42, where it is frequency-divided by an appropriate frequency dividing ratio and then input to the counter 44. The counter 44 is a frequency counter, and supplies the count result for the frequency to the control unit 32 by counting, for example, one period (half period or a plurality of periods) of the divided signal. The control unit 32 detects the oscillation frequency from the count result from the counter 44, and controls the capacitance value of the capacitor bank 38 so that the oscillation frequency becomes four times the target desired station frequency. The capacitance value is similarly controlled. By providing the frequency divider 42, it is not necessary to make the clock of the counter 44 so fast even when counting a half cycle or the like.

なお、制御部３２における周波数の検出は、所定時間内のゼロクロスをカウントするなど、他の方法であってもよい。   In addition, the detection of the frequency in the control part 32 may be another method such as counting zero crosses within a predetermined time.

これによって、同調回路１０の同調周波数が可変抵抗３４により入力された希望周波数に一致するように制御される。   As a result, the tuning frequency of the tuning circuit 10 is controlled to match the desired frequency input by the variable resistor 34.

ここで、インダクタ３６のインダクタンスＬ３をインダクタＬ１の整数分の１にすることで、インダクタ３６を含む系の発振周波数を同調周波数とは比較的高くして、同調信号への影響を排除している。   Here, by setting the inductance L3 of the inductor 36 to 1 / integer of the inductor L1, the oscillation frequency of the system including the inductor 36 is made relatively high from the tuning frequency, thereby eliminating the influence on the tuning signal. .

例えば、Ｌ３＝（１／１６）＊Ｌ１に設定することで、発振周波数を同調周波数の４倍に設定することができる。なお、回路の共振周波数＝１／２π√ＬＣである。   For example, by setting L3 = (1/16) * L1, the oscillation frequency can be set to four times the tuning frequency. Note that the resonance frequency of the circuit = ½π√LC.

ＡＭ放送の周波数帯域は、５２０ｋＨｚ〜１７１０ｋＨｚであり、同調周波数の４倍でれば、発振周波数は２Ｍｚ〜６．８ＭＨｚ程度になり、ＡＭ放送の帯域から離れ、ＡＭ放送の受信への悪影響を排除できる。発振周波数を同調周波数の８倍とすることも可能であるが、発振周波数に応じて設定する同調周波数における誤差が大きくなりやすい。さらに、４倍と８倍の間の数字でもよいが、４倍がわかりやすく、またインダクタの製作も容易になる。   The frequency band of AM broadcasting is 520 kHz to 1710 kHz, and if it is four times the tuning frequency, the oscillation frequency will be about 2 Mz to 6.8 MHz, away from the AM broadcasting band, eliminating the adverse effects on AM broadcasting reception it can. Although it is possible to set the oscillation frequency to eight times the tuning frequency, an error in the tuning frequency set according to the oscillation frequency tends to increase. Furthermore, a number between 4 times and 8 times may be used, but 4 times is easy to understand, and an inductor can be easily manufactured.

制御部３２には、この可変抵抗３４の抵抗値に応じてユーザの希望局周波数を検出し、キャパシタバンク３０，３８の容量を調整し、同調回路１０の同調周波数を希望局周波数に設定するとともに、発振周波数を同調周波数の４倍の周波数に調整する。   The control unit 32 detects the user desired station frequency according to the resistance value of the variable resistor 34, adjusts the capacitance of the capacitor banks 30 and 38, and sets the tuning frequency of the tuning circuit 10 to the desired station frequency. The oscillation frequency is adjusted to 4 times the tuning frequency.

なお、インダクタ１４は、インダクタ１２に流れる電流に応じた電流を流すことができれば、任意のインダクタンスのものを採用することができる。また、上述の例では、インダクタ１２にキャパシタバンク３０を接続したが、インダクタ１４にキャパシタバンク３０を接続し、ここにおいて同調周波数を設定してもよい。   The inductor 14 may be of any inductance as long as a current corresponding to the current flowing through the inductor 12 can flow. In the above example, the capacitor bank 30 is connected to the inductor 12, but the capacitor bank 30 may be connected to the inductor 14 and the tuning frequency may be set here.

このように、本実施形態では、ユーザが周波数調整用のつまみなどを操作して、可変抵抗３４の抵抗値を変更することで、目標同調周波数が設定される。通常は、つまみは目標同調周波数のインディケーションに対し操作される。そして、制御部３２によってキャパシタバンク３８の容量を調整することで発振周波数が目標同調周波数の４倍に設定され、同様にキャパシタバンク３０の容量を対応して調整することで、同調周波数が目標同調周波数に調整される。   Thus, in the present embodiment, the target tuning frequency is set by the user operating the frequency adjusting knob or the like to change the resistance value of the variable resistor 34. Normally, the knob is operated for indication of the target tuning frequency. Then, the control unit 32 adjusts the capacitance of the capacitor bank 38 to set the oscillation frequency to four times the target tuning frequency, and similarly adjusts the capacitance of the capacitor bank 30 to adjust the tuning frequency to the target tuning frequency. Adjusted to frequency.

このような調整の際に、ミュートされることはなく、同調信号を常に出力される。このため、発振周波数に応じて同調周波数を調整するシステムにおいて、ユーザが調整中の出力音を聞きながら同調周波数の調整が行える。   In such adjustment, the tuning signal is always output without being muted. Therefore, in a system that adjusts the tuning frequency according to the oscillation frequency, the tuning frequency can be adjusted while listening to the output sound that the user is adjusting.

なお、同調回路１０が用いられるのは、通常ＡＭ放送を受信するラジオ受信機であるが、同調回路１０が用いられるのであれば、他の放送であってもよい。   The tuning circuit 10 is used for a radio receiver that normally receives AM broadcasting. However, if the tuning circuit 10 is used, other broadcasting may be used.

１０ 同調回路、１２，１４，３６ インダクタ、１６、４０ アンプ、１８ ミキサ、２０ ローカル発振器、２２ バッファ、２４，３２ 制御部、２６ ＩＦ検出部、２８ ベースバンドアンプ、３０，３８ キャパシタバンク、３４ 可変抵抗、４２ 分周器、４４ カウンタ。   10 tuning circuit, 12, 14, 36 inductor, 16, 40 amplifier, 18 mixer, 20 local oscillator, 22 buffer, 24, 32 control unit, 26 IF detection unit, 28 baseband amplifier, 30, 38 capacitor bank, 34 variable Resistor, 42 divider, 44 counter.

Claims (4)

一対のインダクタおよび同調用可変容量部を含み、前記同調用可変容量部の容量を変更することで同調周波数を調整し、受信信号から帯域が限定された同調信号を得る同調回路であって、
前記同調信号に対応する電流を流す発振用インダクタと、
前記発振用インダクタを含む系の発振周波数を調整する発振用可変容量部と、
前記発振周波数が希望同調周波数に対応する値になるように前記発振用可変容量部の容量を調整し、前記発振用可変容量部の調整された容量に応じて前記同調用可変容量部の容量を調整する制御部と、
を含む、同調回路。 It includes a pair of inductors and tuning the variable capacitor unit, a tuning circuit wherein the capacity of the tuning variable capacitor unit to adjust the tuning frequency by changing, to obtain a tuning signal band-limited from the received signal,
An oscillating inductor for passing a current corresponding to the tuning signal;
And oscillating variable capacitance section for adjusting the oscillation frequency of the system including the oscillation inductor,
The capacitance of the oscillation variable capacitor is adjusted so that the oscillation frequency becomes a value corresponding to a desired tuning frequency, and the capacitance of the tuning variable capacitor is set according to the adjusted capacitance of the oscillation variable capacitor. A control unit to adjust;
Including a tuning circuit. 前記発振用インダクタを含む系の発振周波数は、前記同調周波数の整数倍であり両者は相関して調整される、請求項１に記載の同調回路。 Oscillation frequency of the system including pre-Symbol oscillation inductor is an integer multiple of the tuning frequency both are adjusted correlated, the tuning circuit according to claim 1. 前記整数倍は４倍である、請求項２に記載の同調回路。 Before SL integral multiple is four times, the tuning circuit according to claim 2. 前記同調用可変容量部および前記発振用可変容量部はいずれも複数のキャパシタおよび複数のスイッチを有するキャパシタバンクであり、前記複数のスイッチをオンオフすることで容量を変更するようになっている、請求項１に記載の同調回路。The tuning variable capacitor unit and the oscillation variable capacitor unit are both capacitor banks having a plurality of capacitors and a plurality of switches, and the capacitance is changed by turning on and off the plurality of switches. Item 2. The tuning circuit according to Item 1.
JP2012127403A 2012-06-04 2012-06-04 Tuning circuit Expired - Fee Related JP6038493B2 (en)

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